A sample of argon gas is heated from 300 K to 600 K in a rigid container. Which of the following sets of qualitative changes correctly describes how its Maxwell–Boltzmann speed distribution is affected?
a) Total area under the curve increases; the peak shifts to higher speed; the maximum height of the curve decreases.
b) Total area under the curve remains the same; the peak shifts to higher speed; the maximum height of the curve decreases.
c) Total area under the curve remains the same; the peak speed is unchanged; the maximum height of the curve decreases.
d) Total area under the curve remains the same; the peak shifts to higher speed; the maximum height of the curve increases.